Antonyms of polar :
equatorial, noncrucial, tropic, pantropical, hot, pantropic, uncharged, same, tropical, alike, analogous, like, similar, equivalent, identical, synonymous, noncontradictory, lukewarm, tepid, heated, overheated, reheated, warmed, snug, toasty, warm, feverish, flushed, inflamed, canicular, muggy, steamy, summery, ardent, blazing, boiling, broiling, burning, fervent, fervid, fiery, glowing, igneous, molten, piping hot, red-hot, roasting, scalding, scorching, searing, seething, sizzling, sultry, sweltering, torrid, ultrahot, warming, white-hot.
Examples of usage:
Desolate and alone, Annadoah walked along a crevice in the land- adhering ice of the polar sea. "The Eternal Maiden", T. Everett Harré.
Transform into heat a portion of the surplus energy at our disposal; send this heat to the poles; then the polar regions, relieved of their snow- cap, will become a vast territory available for man's use. "In the Year 2889", Jules Verne and Michel Verne.
It is for the purpose of proving this important fact that polar triangles are introduced. "The Teaching of Geometry", David Eugene Smith.